The chart indicates the variation was 3° 48' W in 1996 and the annual change is 8' W. If you use the chart in 2000, how much variation should you apply
Given:
Variation = 3° 48' W in year 1996
Annual change = 8' W
Chart to use = year 2000
Solution:
1. We are going to multiply the annual change of variation by 4 since our reference of variation is in the year 1996, and the chart to use is in the year 2000.
Annual change = 8'
× 4
Correction = 0° 32' W
2. We can now get the actual variation by adding the correction and the variation in 1996.
Correction = 0° 32' W
+
1996 Variation = 3° 48' W
Actual variation = 4° 20° W
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